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Any one can reset the root and other user's password by going in recovery mode. SO I want that on the recovery option GRUB require a password to enter in recovery mode. But user can login UBUNTU without a password requirement.

Any idea?

I do't want to set GRUB2 password. I want to set password on recovery mode option or After recovery mode system need a password to go ahead.

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That does not really help as you can bypass the by booting a live CD and doing the same thing (or other cracks). You need to restrict physical access. Physical access == root access – bodhi.zazen Apr 14 '14 at 16:51
    
@bodhi.zazen yea ... but right now i need to set a password to prevent the password reset of root user. – Umyhacker Apr 14 '14 at 16:55
1  
Maybe the answer of askubuntu.com/questions/31605/how-to-secure-grub-recovery-mode can help you. – Daniel S. Apr 14 '14 at 17:05
    
You are better off encrypting your install. – bodhi.zazen Apr 14 '14 at 17:07

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